I installed a fresh new copy of Moodle 2.0 Preview 4 (Build: 20100705) on a new blank MSSQL database. I created a student and a course with one quiz in it. I enrolled the student in the course.

On the Front Page I go to My profile settings in the Settings block. Then I select Messaging. Under the "Configure destinations for incoming messages" heading I see three columns with [[pluignname]] as the column headings, instead of the actual names.

The three sections below the "Configure destinations for incoming messages" section also have [[pluignname]] as the headings instead of the correct strings.

Notice the spelling error in [[pluignname]]. I assume it should be [[pluginname]]. See attached Before.jpg image.

I searched the moodle code for the "pluignname" string and found three instances:

\message\edit.php
\blocks\tags\edit_form.php
\lib\db\install.xml

If I RENAME those three occurances of "pluignname" to ""pluginname" then the problem seems to be fixed. Home / My profile settings / Messaging shows the correct section and column headings. See attached After.jpg image.